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Nobel’s furniture design was dynamite | Letters

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One-legged stools | Mercia mudstone | Death by fish | Lancia cars | Naming your cold

All this discussion about the relative design and merits of three-legged stools (Letters passim) is as nothing compared with the so-called suicide stool, a one-legged stool designed by Alfred Nobel to prevent operators of the nitroglycerin reaction vats – part of the production process of his dynamite – falling asleep and allowing an exothermic runaway to occur, with the consequent explosion ruining everyone’s day.
Danny Tanzey
Thornton Cleveleys, Lancashire

• Graham Thompson needs to be careful referring to the Keuper marl rock formation as a defining “north/south” feature (Letters, 21 October). I was recently admonished by a geology expert for using this term. “We now call it Mercia mudstone,” I was told. But marl or mudstone aside, north of the Trent is True North.
Martin Russell
Nottingham

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